Quote:
Originally Posted by kerry
Did you rotate the engine manually or with the starter? I don't think manually rotating the engine could bend valve unless you've been working out recently.
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Quote:
Originally Posted by Early Bird
I agree, If you turned it by hand you would come to a point where it would get hard to turn, very noticeable hard to turn any farther. Myself, I doubt bent valves.
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What? You guys are trying to tell me I'm not strong enough to bend steel with my bare hands??
I was thinking the same thing. I figured that if there was any valve to piston contact, I'd feel the crank just stop and go no further. Back in the mid 90s, I worked for a while in a BMW shop and I happened to be there when they were rebuilding a 325 head that had experienced a broken belt at speed. Oh mah God, many valves badly bent.
After I thought it might be possible that I'd bent some valves by hand, I got to thinking that if the contact was very slight, which it would be from being off by a tooth or two, the leverage would be significant, as the piston would be contacting the valve at near the very top of the stroke, when its upward movement would very small in relation to crank rotation. Plus, when you're turning the crank by hand, you have to pull hard enough to get past the compression here and there and you might not notice that you were tweaking a valve a tiny bit.
Not saying this is fact, just my thinking. If I was being paid to do a study on this, I'd go to a bone yard and find a 325 that still had belt intact and try some experiments but in the real world, I'm not likely to know for sure if one could bend a valve by hand this way.
But the point is hopefully moot at this point, because I can't imagine my compression testing out that well with any bent valves.
And, I'll have you know, I have been working out lately.
